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| 3D seismic wave field numerical simulation method and its application |
| Wang Jun |
China University of Mining and Technology (Beijing) School of Earth Science and Surveying and
Mapping Engineering ,Beijing 100083, China |
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Abstract According to the inevitable abrupt boundary truncation in numerical simulation, various boundary conditions for eliminating wave field interference and reflection were discussed. In order to realize 3D seismic wave field imaging, the principle of finite difference method and pseudo spectrum method in three-dimensional elastic wave field was analyzed based on wave theory and corresponding mathematical approximation method, and the idea of programming was introduced. In the example, the cerjan damping absorbing boundary condition and PML perfectly matched layer absorbing boundary condition were applied to the forward modeling of three-dimensional homogeneous medium model; then, in order to further verify the applicability of the forward modeling method in three-dimensional geological conditions, the three-dimensional layered geological body model was used for simulation. By analyzing the results of 3D wave field imaging, more comprehensive and detailed wave field response characteristics can be obtained, and it was helpful to improve the numerical imaging method.
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